Pure genius: Indian inventor claims a reusable portable water purifier costing less than half a dollar

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An Indian engineer claims to have designed a reusable and portable water purifier that costs less than half a dollar in this footage from December 2.

Niranjan Karagi, the entrepreneur is a student from Belgaum in south India's Karnataka.

A video shows Karagi demonstrating the ease of use of his inexpensive purifier called NirNal. He takes a PET bottle filled with murky water. He takes off the cap and replaces it with his tiny experiment before pouring it out into a glass. Surprisingly, t

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